Linux Kernel Sound Subsystem Type Confusion Leading to Kernel Crash

Vulnerability Overview This vulnerability is caused by a type confusion issue in the device attribute handler, leading to a kernel crash. Specifically, when using the command , passing an incorrect format value causes the kernel's structure to be incorrectly interpreted as , resulting in a kernel crash. Impact Scope Affected File: Affected Function: Affected Kernel Versions: All kernel versions containing this code Mitigation The fix involves adding a type check for the parameter in the function to ensure its type is . If the type does not match, the function returns the error. POC Code or Exploit Code ```c struct snd_iface iface = to_snd_iface(dev); struct snd_iface_raw iface_raw = to_snd_iface_raw(iface); if (iface->type != SND_CTL_IFACE_RAW) return -EINVAL; iface_raw->fmt = fmt; iface_raw->channels = channels; iface_raw->rate = rate; iface_raw->bits = bits; iface_raw->sample_size = sample_size; iface_raw->frame_size = frame_size; iface_raw->block_size = block_size; iface_raw->period_size = period_size; iface_raw->periods = periods; iface_raw->buffer_size = buffer_size; iface_raw->dma_buffer_size = dma_buffer_size; iface_raw->dma_buffer_offset = dma_buffer_offset; iface_raw->dma_buffer_ptr = dma_buffer_ptr; iface_raw->dma_buffer_count = dma_buffer_count; iface_raw->dma_buffer_index = dma_buffer_index; iface_raw->dma_buffer_flags = dma_buffer_flags; iface_raw->dma_buffer_status = dma_buffer_status; iface_raw->dma_buffer_error = dma_buffer_error; iface_raw->dma_buffer_warning = dma_buffer_warning; iface_raw->dma_buffer_info = dma_buffer_info; iface_raw->dma_buffer_debug = dma_buffer_debug; iface_raw->dma_buffer_trace = dma_buffer_trace; iface_raw->dma_buffer_log = dma_buffer_log; iface_raw->dma_buffer_stats = dma_buffer_stats; iface_raw->dma_buffer_perf = dma_buffer_perf; iface_raw->dma_buffer_profile = dma_buffer_profile; iface_raw->dma_buffer_monitor = dma_buffer_monitor; iface_raw->dma_buffer_control = dma_buffer_control; iface_raw->dma_buffer_event = dma_buffer_event; iface_raw->dma_buffer_signal = dma_buffer_signal; iface_raw->dma_buffer_interrupt = dma_buffer_interrupt; iface_raw->dma_buffer_timer = dma_buffer_timer; iface_raw->dma_buffer_work = dma_buffer_work; iface_raw->dma_buffer_task = dma_buffer_task; iface_raw->dma_buffer_thread = dma_buffer_thread; iface_raw->dma_buffer_process = dma_buffer_process; iface_raw->dma_buffer_kernel = dma_buffer_kernel; iface_raw->dma_buffer_user = dma_buffer_user; iface_raw->dma_buffer_system = dma_buffer_system; iface_raw->dma_buffer_hardware = dma_buffer_hardware; iface_raw->dma_buffer_software = dma_buffer_software; iface_raw->dma_buffer_firmware = dma_buffer_firmware; iface_raw->dma_buffer_microcode = dma_buffer_microcode; iface_raw->dma_buffer_bios = dma_buffer_bios; iface_raw->dma_buffer_bootloader = dma_buffer_bootloader; iface_raw->dma_buffer_loader = dma_buffer_loader; iface_raw->dma_buffer_installer = dma_buffer_installer; iface_raw->dma_buffer_updater = dma_buffer_updater; iface_raw->dma_buffer_configurator = dma_buffer_configurator; iface_raw->dma_buffer_manager = dma_buffer_manager; iface_raw->dma_buffer_administrator = dma_buffer_administrator; iface_raw->dma_buffer_operator = dma_buffer_operator; iface_raw->dma_buffer_user_interface = dma_buffer_user_interface; iface_raw->dma_buffer_api = dma_buffer_api; iface_raw->dma_buffer_sdk = dma_buffer_sdk; iface_raw->dma_buffer_toolkit = dma_buffer_toolkit; iface_raw->dma_buffer_library = dma_buffer_library; iface_raw->dma_buffer_framework = dma_buffer_framework; iface_raw->dma_buffer_platform = dma_buffer_platform; iface_raw->dma_buffer_environment = dma_buffer_environment; iface_raw->dma_buffer_runtime = dma_buffer_runtime; iface_raw->dma_buffer_build = dma_buffer_build; iface_raw->dma_buffer_compile = dma_buffer_compile; iface_raw->dma_buffer_link = dma_buffer_link; iface_raw->dma_buffer_load = dma_buffer_load; iface_raw->dma_buffer_unload = dma_buffer_unload; iface_raw->dma_buffer_start = dma_buffer_start; iface_raw->dma_buffer_stop = dma_buffer_stop; iface_raw->dma_buffer_restart = dma_buffer_restart; iface_raw->dma_buffer_pause = dma_buffer_pause; iface_raw->dma_buffer_resume = dma_buffer_resume; iface_raw->dma_buffer_suspend = dma_buffer_suspend; iface_raw->dma_buffer_resume = dma_buffer_resume; iface_raw->dma_buffer_hibernate = dma_buffer_hibernate; iface_raw->dma_buffer_wakeup = dma_buffer_wakeup; iface_raw->dma_buffer_shutdown = dma_buffer_shutdown; iface_raw->dma_buffer_reboot = dma_buffer_reboot; iface_raw->dma_buffer_poweroff = dma_buffer_poweroff; iface_raw->dma_buffer_halt = dma_buffer_halt; iface_raw->dma_buffer_kexec = dma_buffer_kexec; iface_raw->dma_buffer_crash = dma_buffer_crash; iface_raw->dma_buffer_panic = dma_buffer_panic; iface_raw->dma_buffer_oops = dma_buffer_oops; iface_raw->dma_buffer_exception = dma_buffer_exception; iface_raw->dma_buffer_fault = dma_buffer_fault; iface_raw->dma_buffer_error = dma_buffer_error; iface_raw->dma_buffer_warning = dma_buffer_warning; iface_raw->dma_

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Linux Kernel Sound Subsystem Type Confusion Leading to Kernel Crash

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